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    <title>Document</title>
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    <script>

        // 遍历字符串
        //   for in
        //   for of
        //   for

        var str = 'hello' ;
        // for(var i in str) {
        //     console.log(str[i]) ;
        // }


        // for(var v of str) {
        //     console.log(v) ;
        // }


        for(var i = 0 ; i < str.length ; i++) {
            console.log(str[i]) ;
        }

    </script>
    
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